### Appendix 6 Detailed Risk Modeling ResultsSource Category Facility NEI ID Facility Name Address City State

Ferroalloys 39167NEI11660 Eramet 16705 State Route 7 South Marietta OH Ferroalloys 54053NEIWV053FELMAN NEW HAVEN PLANT US ROUTE 62 NORTH NEW HAVEN WV Table 1 - Facility Identification Information

1 of 1Cancer MIR Cancer

Incidence Noncancer

Max HI Target

Organ
54053NEIWV053FELMAN 

### 1.81E-05 6
. 6E -04 3.06 E+00 neurological 39167NEI11660 

### 1. 29E-05 1. 8 E-03 3.70E+00 neurological
54053NEIWV053FELMAN 

### 8.75 E-06 3. 6E -04 9. 9E -0 1 neurological 39167NEI11660 

### 9. 63E-06 1
. 3E -03 1.04 E+00 neurological 1 BOLD indicates a cancer risk greater than 1 in a million or a noncancer risk greater than 1

Table 2 – Maximum Predicted HEM-3 Chronic Risks

Control Scenario Baseline scenario Facility NEI ID Source Category Chronic Risk 1

1 of 1REL AEGL1 ERPG1 AEGL2 ERPG2 54053NEIWV053FELMAN Hydrofluoric acid 7.3E+00 2.1E+00 1.1E+00 8.8E-02 1.1E-01 54053NEIWV053FELMAN Arsenic compounds 6.7E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 39167NEI11660 Arsenic compounds 6.3E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 39167NEI11660 Hydrofluoric acid 4.6E+00 1.4E+00 6.9E-01 5.5E-02 6.9E-02 54053NEIWV053FELMAN Formaldehyde 4.0E+00 2.0E-01 1.8E-01 1.3E-02 1.8E-02 54053NEIWV053FELMAN Mercury (elemental) 2.1E+00 0.0E+00 0.0E+00 7.5E-04 6.4E-04 39167NEI11660 Formaldehyde 1.6E+00 8.0E-02 7.4E-02 5.2E-03 7.4E-03 39167NEI11660 Mercury (elemental) 9.0E-01 0.0E+00 0.0E+00 3.2E-04 2.7E-04 54053NEIWV053FELMAN Hydrochloric acid 7.2E-01 5.6E-01 3.4E-01 4.6E-02 5.0E-02 39167NEI11660 Hydrochloric acid 2.4E-01 1.9E-01 1.1E-01 1.5E-02 1.7E-02

REL AEGL1 ERPG1 AEGL2 ERPG2 54053NEIWV053FELMAN Hydrofluoric acid 5.8E+00 1.7E+00 8.7E-01 6.9E-02 8.7E-02 54053NEIWV053FELMAN Formaldehyde 3.6E+00 1.8E-01 1.7E-01 1.2E-02 1.7E-02 54053NEIWV053FELMAN Arsenic compounds 2.5E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 54053NEIWV053FELMAN Mercury (elemental) 2.1E+00 0.0E+00 0.0E+00 7.6E-04 6.4E-04 39167NEI11660 Arsenic compounds 1.8E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 39167NEI11660 Mercury (elemental) 9.0E-01 0.0E+00 0.0E+00 3.2E-04 2.7E-04 39167NEI11660 Hydrofluoric acid 8.2E-01 2.4E-01 1.2E-01 9.8E-03 1.2E-02 39167NEI11660 Formaldehyde 7.0E-01 3.4E-02 3.2E-02 2.2E-03 3.2E-03 54053NEIWV053FELMAN Hydrochloric acid 4.7E-01 3.7E-01 2.2E-01 3.0E-02 3.3E-02 39167NEI11660 Hydrochloric acid 4.8E-02 3.4E-02 2.2E-02 3.1E-03 3.4E-03
Note: BOLDindicates acute risks greater than 1 Baseline Modeling Scenario

Post-Control Modeling Scenario Facility NEI ID Pollutant Maximum Hazard Quotient 1

1 Some maximum acute impacts may be at onsite locations. Table 3 – Maximum Predicted Acute Risks (HEM-AERMOD)

Pollutant Ferroalloys Maximum Hazard Quotient 1 Facility NEI ID

1 of 154053NEIWV053FELMAN Hydrofluoric acid REL 7 <1 54053NEIWV053FELMAN Arsenic compounds REL 7 <1 39167NEI11660 Arsenic compounds REL 6 <1 39167NEI11660 Hydrofluoric acid REL 5 <1 54053NEIWV053FELMAN Formaldehyde REL 4 0.6 54053NEIWV053FELMAN Mercury (elemental) REL 2 0.2 54053NEIWV053FELMAN Hydrofluoric acid AEGL1 2 0.4 39167NEI11660 Formaldehyde REL 2 0.5

54053NEIWV053FELMAN Hydrofluoric acid REL 6 <1 54053NEIWV053FELMAN Formaldehyde REL 4 <1 54053NEIWV053FELMAN Arsenic compounds REL 3 <1 54053NEIWV053FELMAN Mercury (elemental) REL 2 <1 39167NEI11660 Arsenic compounds REL 2 <1 54053NEIWV053FELMAN Hydrofluoric acid AEGL1 2 <1 Notes: 1 - Facilities with a HEM-3 screening acute value greater than 1 were refined. 2 - See Appendix 7 for figures depicting off-site impacts. Ferroalloys
Facility NEI ID

Post-Control Modeling Scenario Facility NEI ID Pollutant Criteria HEM-3 (Screening) Refined

Results 1 Applied process-specific acute factors and

examined results for maximum off-site impact

Refined Modeling Approach 2 Table 4 – Maximum Predicted Acute Risks Greater than 1 (Refined Approach)

Refined Modeling Approach 2 Pollutant Criteria HEM-3 (Screening) Refined

Results 1 Baseline Modeling Scenario

Applied process-specific acute factors and examined results for maximum off-site impact

1 of 1